EP0410465A2
Expired / Lapsed
EP
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Solid state image pickup device having photo-shield plate in contact with photo-electric converting region via Schottky barrier
Assignee: NEC Corp
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Filing: 1990-07-26
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Granted: —
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Expires: 2010-07-26
Abstract
Abstract A solid state image pickup device is fabricated on a semiconductor substrate (1) and comprises a well (2) formed in a surface portion of the semiconductor substrate, photo-electric converting regions (3a to 3f) arranged in rows and columns and converting parts of an optical radiation into electric charges, respectively, charge transferring regions (4a and 4b) associated with the columns of the photo-electric converting regions, respectively, and conveying the electric charges, charge transferring electrodes (9) allowing the charge transferring regions to convey the electric charges, and a metallic photo-shield plate (11) preventing the charge transferring regions from the optical radiation and exposing the photo-electric converting regions to the parts of the optical radiation, in which the metallic photo-shield plate is in contact with the photoelectric converting regions for forming Schottky barriers therebetween and excess electric charges flow into the metallic photo-shield plate over the Schottky barriers.
Inventors
- 👤 Kazuhisa C/O Nec Corporation Nagaya
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 22:40
CPC Classifications
H; H10; H10F; H10F39/00; H10F39/10; H10F39/12; H10F39/15; H10F39/158; H04; H04N; H04N25/00; H04N25/60; H04N25/62; H04N25/621; H10F39/153
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
227 words
A solid state image pickup device fabricated on a semiconductor substrate (1) of a first conductivity type, comprising: a) a well (2) having a second conductivity type opposite to said first conductivity type and formed in a surface portion of said semiconductor substrate; b) a plurality of photo-electric converting regions (3a to 3f) of said first conductivity type arranged in at least one line and converting parts of an optical radiation into electric charges, respectively; c) a plurality of charge transferring regions (4a and 4b) of said first conductivity type associated with the line of said photo-electric converting regions, respectively, and conveying said electric charges, each of said charge transferring regions being spaced apart from the associated line of said photo-electric converting regions by a channel forming region (6); d) charge transferring means (9) provided over said charge transferring regions and allowing said charge transferring regions to convey said electric charges; and e) a metallic photo-shield plate (11) preventing said charge transferring regions each being contiguous to said channel forming region from said optical radiation and exposing said photo-electric converting regions to the parts of said optical radiation, characterized in that said metallic photo-shield plate is in contact with said photo-electric converting regions for forming Schottky barriers therebetween, and in that and in which excess electric charges overflow beyond said Schottky barrier into said metallic photo-shield plate.
Claim 2
Dependent Claim
227 words
A solid state image pickup device fabricated on a semiconductor substrate (1) of a first conductivity type, comprising: a) a well (2) having a second conductivity type opposite to said first conductivity type and formed in a surface portion of said semiconductor substrate; b) a plurality of photo-electric converting regions (3a to 3f) of said first conductivity type arranged in at least one line and converting parts of an optical radiation into electric charges, respectively; c) a plurality of charge transferring regions (4a and 4b) of said first conductivity type associated with the line of said photo-electric converting regions, respectively, and conveying said electric charges, each of said charge transferring regions being spaced apart from the associated line of said photo-electric converting regions by a channel forming region (6); d) charge transferring means (9) provided over said charge transferring regions and allowing said charge transferring regions to convey said electric charges; and e) a metallic photo-shield plate (11) preventing said charge transferring regions each being contiguous to said channel forming region from said optical radiation and exposing said photo-electric converting regions to the parts of said optical radiation, characterized in that said metallic photo-shield plate is in contact with said photo-electric converting regions for forming Schottky barriers therebetween, and in that and in which excess electric charges overflow beyond said Schottky barrier into said metallic photo-shield plate.
Claim 3
Dependent Claim
58 words
A solid state image pickup device as set forth in claim 1, in which said solid state image pickup device further comprises a contact region of said second conductivity type formed in each of said photo-electric converting regions and in which said metallic photo-shield plate is in contact with said contact region for forming a Schottky barrier therebetween.
Claim 4
Dependent Claim
95 words
A solid state image pickup device as set forth in claim 1, in which a predetermined number of said photo-electric converting regions are associated with each of said charge transferring region and in which a channel stopper region of said second conductivity type is formed on both sides of a combination of said photo-electric converting regions and said associated charge transferring region, wherein said channel stopper is in contact with a spacer region formed in a surface portion of each photo-electric converting region, thereby propagating a voltage level of said well to said spacer region.
Claim 5
Dependent Claim
40 words
A solid state image pickup device as set forth in claim 1, 2 or 3, in which said solid state image pickup device selectively enters at least a charge accumulating mode of operation and an electronic shutter mode of operation.
References Cited (Backward Citations)
No citation records indexed.
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